Among the risks described by Dr. Pierre D'Hemecourt, a sports medicine specialist at Children's Hospital Boston, are stress fractures in the back, inflammation of growth cartilage, back and neck strain, and nerve damage in the neck and shoulders.

波士顿儿童医院(Children's Hospital Boston)的运动医学专家皮埃尔·戴米库(Pierre D'Hemecourt)描述了一系列危害，包括背部应力性骨折、生长板软骨发炎、后背和颈部压力、以及背部和肩膀的神经损害。

The federal Consumer Product Safety Commission calculated that carrying a 12-pound backpack to and from school and lifting it 10 times a day for an entire school year puts a cumulative load on youngsters' bodies of 21,600 pounds — the equivalent of six mid-sized cars.

联邦消费者产品安全委员会(Consumer Product Safety Commission )计算得出：假设一个学生每天背着12磅的书包往返，每天抬起书包的次数以10次计，一学年下来，这个孩子的身体总共要承担21600磅（约合9800公斤）的负担——相当于6台中型小汽车。

The issue has been raised repeatedly in countries all over the world for more than a decade. In December 1999, doctors in Milan reported in The Lancet that 34.8 percent of Italian schoolchildren carried more than 30 percent of their body weight at least once a week, "exceeding limits proposed for adults."

在过去这十几年来，世界各国都在反复探讨这个问题。1999年12月，米兰的医生们在《柳叶刀》(The Lancet)上发表报告称，每周至少有一次，34.8%的意大利学童要背负超过自身体重30%的书包，“这超出了向成年人推荐的负重上限。”

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